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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f95a6db73905e115ebd6d50030924bc2511711520d6fff94d56242c8b545d02' 
  AND token = 'XyhLym6kQZFnME/g+LJn+02mI7jlr5fs2zuN/5pM8co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}