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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5feb4aad7e7bbaf30bd94c80d080fe861faf13a2c8a50f9c67b95794131aef' 
  AND token = 'ntrRStDSs9JiHqU2fZn/CrYp3XsFfZg18b3gpIFWOLw=' 
  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"
    }
  }
}