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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b29227919d4eac9804b1fad69a7de210e4a34b18ac6706c4c6dc14a2b21e79' 
  AND token = 'Nf3DaqRifaSpZ6yYQi8+alec39B8YuVlAz00dg82IcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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