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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1e250d11a70b373d904c2e18840bf5717a949fb998d03be1e61bea053c3be5' 
  AND token = 'aaAlUuxz5thD06mXrtK8skFMDOHg7BKyF7YnznyY3ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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