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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e92b5ae1d5de9c048ae7a8bab750e3aa359096c59eedf2ad26543e0e2441b5' 
  AND token = 'rsmlTyLDNZXGx5k3PG9xGV0JFkNgASiTHr4PvAj2UTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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