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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d05533442069a0ca4caf4c2c2bdc6dd0ae4bf80f524e525e02a91094dffed9' 
  AND token = '4mOPpe28VTacRQ0WuZr2jp3FO/SHuWTibe0bsvBxdSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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