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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd2f69dbae37eea30600b1f5cf5cd338a787b52da1bc2d5f35acde436e13fb6' 
  AND token = 'vSVhoG6A7c0N4Y6UQbbglakFEaPXLj+USqbKR9uBV0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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