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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a6c607cbfc1b0f12786e0bef3d4ea7be9698368bccb5055c178d27b1bc99c7' 
  AND token = 'tbPjhYSNldTUjBjq42WCC0SeTV1NO3Afrz4V6ecTRgg=' 
  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"
    }
  }
}