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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f72753dcd84510f58f77063ca3f3e4d4e371440a8f749c69d7e89002067599' 
  AND token = 'eVrIiI/iSqtyrhnIg8cP1uIeGhQO/ZwErG8wcT9FujI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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