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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b54f14b95b1c66632e3cac7493e6c5db360701723decfce95509e189dc1e28' 
  AND token = 'xf+mwfITm8JoI0zXkw4ZFhCSJ1CbNp79nbMOlEq9kAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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