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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39c85a8a6193d2605b2679939f39a817700905df001369fdd5d8bf5eae2c67a' 
  AND token = '4uKSrXxJbXXZ+iakW554CoHDjGB4YOidRWe+RTn5b6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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