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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ff6c226a076616735ee2284e0329fc3fb4e408ce225889f032c3964cc522f4' 
  AND token = 'H9T8cgUQGMeUgfR8hQU2b0a37/Q7K5DWEtOtlwvgxBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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