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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cc3fd313fb0e28d326b155a609476d8b754f408f663ecc7545e26d456c7653' 
  AND token = 'ohhg5m6ybcmpN2LeYf4vfb2oSXa5uEn6bgMWPJU7ejg=' 
  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"
    }
  }
}