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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594b038679ce5ffcdbb2d27a3d7bc2fedde39c28cda3aba5c1f4ba65a094111c' 
  AND token = 'R2iOcdWq7njGOXSp3fhatc4/exC8IisFVPMrU2RhsfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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