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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9519e4a374b03e5ab34d389a01483039e7ae42e509c4e85f2ecdbe4f2b90c4' 
  AND token = 'UoXi2+ce5AuFcA+PmBGBmbSK4gzcQesnJc5Q8FMYRS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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