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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f619e25747c24453b1eb2fd2a9401ffb8647a8830394142eeae29de4fb8af47f' 
  AND token = 'N0Tl09n2kkQZEuJCUyHpXuvTSb8X4TC7NomKvUKC8PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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