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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cdb218e403eaf656d07dc9c922cee21f9620a9151088cd54e6259eb4cb86565' 
  AND token = '2GYeeWDJOc3b06ko7I1h936isDqMg9ZmuWJGYwoOHXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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