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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23dd690eab4be38838664aed1ee0dbe56513eadd60c226a57bf1a1cec2fdef4' 
  AND token = 'WgamhbcJIP1IUpP0/TJvC8x4DIUq3cRifE+LdQ8Dt6g=' 
  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"
    }
  }
}