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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84bbb4bfbab45b26707b92ea94dfd5b358b485667025069829e46f881276ba5' 
  AND token = 'bS4t1CV6YCYpl3vsVAGM5zVTSsChbh3p+a6nKhREk3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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