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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9038092c13c0e0a436d5a2392f4ae297415589e277e75a0679c73a1a46d0ab7' 
  AND token = 'cShFoyaEHmNmx6JU4YWCZWTupMQ+jE01oIQLRSVy+FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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