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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c21b64801b2c111247cab4a241358698d42eae1d1d06d6c9bbebe55432188e' 
  AND token = 'Vgbk0lzyvsnqdzzopSVCfH/Xh25BJ8Izo03WHp8jP5o=' 
  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"
    }
  }
}