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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc1f03e1583b315246bb6531400677d0bf6bbf6175636f47d3d2bcad8a365c2' 
  AND token = 'tbVi1u0Vjxk7xj3b1xik5sk7KJjwAQBaPm4b5LzzniU=' 
  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"
    }
  }
}