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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c26a84b116ef0db5032a64d273952c860fb13ec477143868f1d876f2772a5ad' 
  AND token = 'RPSarM6g4P3+6MEhs5y9IlLcZnXdNwGxuZzvFRvk2vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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