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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb9ec5509d93576746c5bc56e5f53c09f7e6d6b3183ee25fe7a6f37ed7bc67e' 
  AND token = 'gquexglWBITipiL0Xj528Gor98m0Yni6bFAc6sKNBFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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