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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f30dd39b80425af484f2d2dbc38f738343862c033e1557db8b8de07ecc49ebb' 
  AND token = '8hvBhXTLcVoj/fLhpN7W4UlHCxkhVRhM/HCtA2KkF+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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