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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3ca0424cebf1e71e92d61af2e5c7607c2d0e30f8045aeb84c954e8510af5e3' 
  AND token = 'MdDmFo6kM3Z05kYbRpnkFqhSozf9GVyAdejfaWbVhwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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