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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6ff0fddd6919adfc78b2cebfbfe45fe4b90c0bca2a3cd1bc2bda2eeb5612ea' 
  AND token = '5tg8J7r8PzZ/gNPLMKitXMxh6Z3Aj7bV0N5sLyTF9D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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