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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce738fd5484cdddf731ba6cc24a8921c50fbcbb90b9d82e1155f009eacdcfce' 
  AND token = 'd0Dhq1geUpD2AS5solZE+AWS2tAFpeo5LaY8e9Qy7cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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