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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4840d66deefa581e76921cd36506df3abc4bc07138cd07692ac60c4ae567939' 
  AND token = 'BtoqQCh4vzuk5NmB2CZ4TXRP8TZ879leB1Bidf2ZFJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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