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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0e9938788551d43ebbe167f9fe800101657b63bbd422f86cce524f0d33204b' 
  AND token = 'p4J6RRjH6HubDldzQ+yXLqehQrPy8KpVeilgt1HjFNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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