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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf40e7f5fe01aa8940e6c0fd5785a8c56058aec50e4dd303e1eb58630538a8c' 
  AND token = 'w8aXaHF32feo9z7OSEsoeqy95n/q9mHZkQTPw7LOIlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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