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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488dfd34d985499b8bf5f7fa46a0e1cc49d66b1449fbf745456be5b6efc6143f' 
  AND token = 'wDp2Oe7UA0YtiaIvMxNDm7LsFB/LFGzVLn1MiVCGCqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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