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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1364b10d3bf12803b1aa36084e30b0c9f1f4daaea71c659c63c09885a307d1' 
  AND token = 'vc1U3ndaPOw/jUtD3tlM44g9yWWFuH1m6mpVr5wtvK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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