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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed7b1253a6c9c1ece21efd8cc91b7f4fc90fbc4360f754c7254bcdf94a96a88' 
  AND token = 'FbphEgJ4nLDqSBlGAsd2NTan6cArqHbmOoL3pir6Xn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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