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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3be5f533d592c719330363c4871829839db77dc0e4d1f4b67564d603c1031f9' 
  AND token = 'CtBNNombaoS3k9i+rmIyyKr9YcXRVbkhZun/sOtZGh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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