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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eaba2af6c7925d05d4a9690c308e66a6e57965b36becb7b8a974f324a82ec01' 
  AND token = 'hFt+RhqInaPr/7uMsjR8NUY8WTSyFQctJCMPLP69jIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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