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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208a3a40c7f65afb29e95ea7de190799ac1d31b50802d5af1eda58353f1a55ee' 
  AND token = 'SRGWvsSFcXLe5G1zW5CJT2POQ/v1/0/rF1r1wUfCJTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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